Draft-gage



A. T. BALDWIN, DEQ'D. C. P, BALDWIN, EXECUTRlX- am GAGE. 7

APPLICATION FILED DEC. l3, 19.

3 SHEETS-SHEET I- INVENTOR PatentedSept. 14,1920;

A. T. BALDWIN, DEC'D. c. P, BALDWIN, EXECUTRIX.'

DRAFT GAGE, APPLICATION man 050.13, I917.

PatentedSept. 14,1920.

3 SHEETS-SHEET 2- A. T. BALDWIN, DECD. C. P. BALDWIN. EXECUTRIX. DRAFT GAGE. APPLICATION FILED DEC. 11% I917.

1 352, 7 1 9, Patented Sept. 14, 1920,

3 SHEETS-SHEET 3.

x E 4 's I /4 O/YLM/EJ-J F/6.4: INVENTOR ATTORNEYS ABRAM T. BALDWIN,

0F SAID ABBA-M T. BALDWIN, DECEASED.

DRAFT-GAGE,

Application filed December 13, 1917.

To all whom it may concern:

Be it known that I, ABRAM T. BALDWIN, a citizen of the United States, residin in the city of Detroit, county of Wayne, btate of Michigan, have invented a new and useful Draft-Gage, of which the following is a specification.

The primary object of my invention is to concentrate the draft gages or independent pressure regulators which indicate the three drafts of a boiler unit, namely, the primary draft or that for primary combustion, the pressure draft in the combustion chamber and the pressure of the gases beyond the combustion chamber and at or near the outlet from the furnace.

In general practice the pressure or draft gages which indicate the several pressures or drafts of a typical boiler-unit, have been placed either at different points upon the boiler front or at places remote from the boiler front so that it has been difficult and sometimes impossible for the average operating boilerman to see at a glance the controlling draft conditions of the boilerunit as a whole.-

In the past practice it usual to resort to types known as slant tube differential made partly of glass and angularly disposed.

Apart from wholly dispensing with gages of this type and employing simple types of dials having pointers operating after the eneral manner of the pointers'or' index ngers of steam gages, I eliminate glass from my construction and resort wholly to metal 'with the result of making a more serviceable and durable device and one moreover which may be easily understood by the average boilerman.

The object of my present invention, generally expressed, is to devise a draft gage in has, moreover, been which independent readings are obtamed by means of independent but concentrated pressure regulators so that, for example, when the device is usedwith a furnace, the engineer will have visibly indicated the pressure of the draft for primary combustion, the pressure in the combustion chamber above the grate, and the pressure of the gases at the outlet of the furnace, the readings being preferably arranged in superposition and as indicative of the order of their occurrence in the furnace, so that the engineer can readily determine at a glance the Specification of Letters Patent.

of gages technically In the accompanying Patented Sept. 14, 1920.

Serial No. 206,977.

exact condition of the gases in the furnace and thus be enabled to operate the furnace at a maximum degree of efficiency.

In the practical making up of my gage, the different readings or graduations are disposed in succession or consecutive assemblage within a single, compact, confining case, and preferably so arranged that the lower reading of the assemblage will correspond to and indicate the first change which takes place in the gases, such, for example, as the variation in pressure of the air entering beneath the grate for primary come bustion,-then, that the reading above the lower reading, or that in the present instance which is the middle reading of the gage, will indicate the second change which takes place in the gases or the pressure of the gases in the combustion chamb,er,-and, lastly, that the third or uppermost reading will indicate the last change or that which means the variation in pressure at the outlet of the furnace,with the result; as already mentioned, that the engineer can see at a glance the exact variations which have taken place in the gases as they pass through the furnace.

By this preferred arrangement it will be quite obvious that the gages will indicate step by step, so to speak, but at a single glance the course of the gas through the furnace in such away that an unskilled furnace man cannot misunderstand it.

With the foregoing objects invention comprehends a gage, typicalembodiments of which are represented in the accompanying drawings and hereinafter described, the particular subject-matter which I claim as novel being defintely specified in the claims.

' In order to illustrate my invention, I have OF DETROIT, MICHIGAN; CATHERINE P. BALDWIN EXECUTRIX in view, my 7 in the drawings shown two embodiments of it which are at present preferred by me,

because in practice theywill give satisfactherefore limited to the. recise arrangement my lIlVQntlOIb is. not

and organization shown inthe drawings and hereinafter described. 4 4

drawings 3 '3' Figure 1 represents in perspective a. ferential gage fora boiler-unit embodying dif-i a elevation through Fig.2

my invention, indicating a convenient arrangement of dials, the upper of which indicates the damper draft, the middle the draft of'the combustion chamber, and the lower the forced draft.

Fig. 2 represents in front elevation, with the face plate of the gage-casing removed, the gage of Fig. 1, the view indicating an embodiment in which three sets of diaphragms are interposed between the inlets,

and the pointers of the three dials.

Fig. 3 represents a vertical, side, sectional on the'dotted line of said Fig. 2.

, merely, but it enables me Fig. 4 represents a view similar to that of Fig. 2, except that but two used, one in connection with the upper dial, the other in connection with the lower, while in connection that of the combustion chamber, I have 'illuS-. trated a liquid seal invented by me and of the character set forth in an application for platent executed by me on the 6th day of arch, 1917. Fig. 5 is a of Fig. 4.

Similar numerals of reference indicate corresponding parts. I

eferring to the drawings: 1 designates a hollow of sheet metal and of quadrangular form. he construction of the casing as such from a mechanical viewpoint is immaterial but the drawings show a convenient shape of it and mode of putting it together, detailed explanation of which is unnecessary. The back of the casing is designated 1", and in its front or face plate 2 are introduced three dial windows one above the other, of glass or other transparent material, which are designated respectively 4", 6? and 8 and which stand in front of and expose to view dials respectively designated 4, 6 and 8, which are mounted in superposition, that is to say one above the other, but slightly separated from each other upon a pair of carrying brackets 2 ofthe casing.

Each dial is provided with the usual scale,5 being that of the damper dial 4,- 7 that of the combustion dial of the forced draft dial 8.

Operating in connection with each of the dials is a pointer,-1O pointer of the damper dial 4,l1 the pointer of the combustion dial 6,and 12 the pointer of the forced draft dial 8.

vertical section on line 55 he pomters, as will be understood by reference to Figs. and 5, are each so bent as to have their pointing ends between the casing wlndows andthe dials. is a matter of convenience of construction pose of them with relation to both the dials and the diaphragms.

diaphragms are with the intermediate dial or casing preferablythe character set forth in an me upon the sixth day connected with the back 1" pared to that of 6,and 9 that designating the This formation properly to dis- The swing or oscillation of these pointers is such as is usual in gages of the general character of steam gages, and the movement of each pointer is due'to the pressure which enters the regulator through the inlets which are respectively connected with the main draft conduit of the furnace, the combus tion chamber and the damper outlet. The furnace which is of any preferred character is not illustrated.

Thus, in the present instance, I have designated the inlet or conduit which is-connected with the furnace outlet or damper draft and the pointer 10, as 13,' the inlet or conduit which is connected with the combustion chamber and the pointer 11, as l4, and the inlet or conduit which is connected with the furnace main draft conduit of the furnace and the pointer 12, as 15:.

' In the construction .of Figs. 2 and 3, there are interposed between the respective inlets and the pointers, flexible box or bellows diaphr'agms, so called, which under the pressure of the gases admitted to them through the respective inlets, expand or contract so as,'each, to raise or lower a lifting rod which is connected with abalanced shaft upon which a pointeris mounted.

Any desired character of diaphragm, or equivalent device, may be resorted to. I prefer, however, to utilize such 'a bellows diaphragm as is patented to John F. Simmance and Jacques Abady, in and by Letters Patent, N 0. 1,064,555, dated June lQth, 1913.

It mightfurthermore be here explained that\in the construction shown in Figs. 4 and 5, I have employed but two bellows diaphragms, one connected with the damper draft pointer and the other with the forced draft pointer,while in'connection with the combustion chamber draft pointer I have used a liquid seal invented by me and of application for patent executed by of March, 1917, which is constructed upon the same principle as a chemical balance and the sensibility of which can be comsuch a balance.

he mounting of the pointers is preferably the following,and as they are they same, a description will servekfor all.

Selecting the forced draft pointer 12,- 19 designates a pair of standards erected from the bottom of secured thereto. Between the standards is pivotally mounted anoscillatory balance shaft 20, upon which is fixed a hub 21 ofthe pointer 12, so .that as the pointer is fixed to its hub it will oscillate with the shaft.

'22 is a bal the hub of the pointer and fixed thereto. is what I term a diaphragm balance,

of the mounting of one 23 the the casing and fixedly ance weight depending from i same being a balance weight carriedby an arm 24 fixed to the balanced shaft and extending beyond said shaft away from the balance 23 and connected by a link 25 to a lifting rod 26 the lower end of which is connected with the diaphragm; V

The balanced shaft 20 is at one end pivoted at 27 to the inner end of a bell-cranklever 28, fulcrumed at 29 to one of the standards 19, which lever at its other end is connected with an adjusting bolt 30'the out departing from the spirit or scope of the invention or sacrificingany of its advantages. I

Having thus described my invention,

what I. claim as new and desire to secure by Letters Patent, is

1. In a draft gage,-an inclosing casing,a plurality of dial windows disposed one above the other in the front face of the casing,a corresponding plurality of dials visible through said windows,-a plurality of pointers corresponding and operativewith respect to the dials,a corresponding plurality of pointer-actuating mechanisms,and a corresponding plurality of furnace-connecting pipes, said dials being arranged one abovethe other in the same order as the flow of gases of which the I pressures are to be measured.

2. In a draft gage,-an inclosing casing,a plurality of dial windows disposed one above the other in the front face of the casing,a corresponding plurality of dials visible through said wind0ws,-a plurality of pointers corresponding and operativewith respect to the dials,a corresponding plurality of pointer-actuating mechanisms suppbrted from the back of the casing, and a corresponding plurality of furnaceconnecting pipes, said dials being arranged one above the other in the same order as the flow of gases of which the pressures are to be measured.

3. In a draft gage,an inclosing casing-,--a plurality of dial windows disposed one above the other in the front face of the casing,a corresponding plurality of dials visible through said windows,-a plurality of pointers corresponding and operative with respect to the dials,--a corresponding plurality of pointer-actuating mechanisms supported from the back of the -casing,and a corresponding plurality -of furnace-connecting pipes which enter the casing below the dials, said dials being arranged one above the other in the same order as the flow of gases of which the pressures are to be measured.

In testimony whereof ABRAM T. BALDWIN.

Witnesses:

' I-I. S..FAIR ANKs,

C. D. MOVAY.-

I have hereunto 3 signed my name this 12th day of December, 

